Improvement in locomotive-boilers



UNITED STATES PATENT OFFICE.

SAMUEL J. HAYES AND EDWARD T. JEFFERY, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN LOCOMOTIVE-BOILERS.

Specification forming part of Letters Patent No. 116,836, dated July 1l, 1871.

To all whom it may concern:

Be it known that we, SAMUEL J. HAYES and EDWARD T. J EFFERY, of Chicago,in the county of (look and State of Illinois, have invented a new and useful Improvement in Locomotive and other Boilers; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing' forming part of this specification.

rlhis invention relates to an improved method of putting in the crown-bars employed in locomotive and other boilers for staying the crownsheet. The invention is also applicable to stationary or portable or marine boilers when constructed with an inside furnace requiring crownbars. The said improvement consists in extending the crown-bars across the boiler to the outside sheets of the shell, and supporting each end of them on a bar or angle-plate bolted or riveted to the shell, and also bolting the shell to the ends of the crown-bar. When necessary, the rods may be used extending across from side to side ofthe shell above or between the crown-bars.

Figure l is a longitudinal sectional elevation of' a locomotive-boiler arranged according to our improvements. Fig. 2 is a transverse sectional elevation.

Similar letters of reference indicate corresponding parts.

A is the shell of the boiler; B, the crownsheet; and D, the crown-bars, which are employed to stay the crown-sheet by means of the bolts E. We propose to rest the ends of these crown-bars on the angle-bars F, bolted or riveted to the sides of the boiler-shell, as shown, and we apply the bolts G to the ends ofthe said bars for bolting the shell iirmly to them. In some cases we may also use the stay-bolts I, but ordinarily they will not be needed when the bolts are used. The Y furnaces ofthe boilers as now constructed, with the crown-bars resting on the corners, sustain on their sides a the pressure on the crown-sheet, except where relieved by braces extending from the crown-sheet to the shell, and Washers are placed around the crown-bolts. A large portion of the crown-sheet is covered by the ends ofthe crownibars and the washers, which materially affect the life ofthe sheet. The circulation of the water is also impeded by the ends of the crown-bars and the washers around the crown-bolt. The scale formed in the braces falls on the crown-sheet, and, with that deposited thereon by the water, increases the liability of the sheetto fail.

By our method the furnace is relieved of a large portion of the pressure on the crown-sheet. No washers are necessary around the crown-bolts, and the ends of the crown-bars do not rest upon the corners of the furnace, so that almost all the crown-sheet is exposed to the water, which also has a greater freedom of circulation, owing to the absence of the washers. Fewer braces are necessary in the boiler over the furnace, which cheapens the cost of construction and lessens the de posit of sca-le on the crown-sheet.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- The crown-bars, extended over the furnace to the sides of the boiler-shell and resting upon bars of angle or other iron, F, bolted or riveted to the shell, the ends of the said bars and the shell of the boiler bein g bolted together, all substantially as specified.

SAML. J. HAYES. EDVARD T. JEFFERY.

Witnesses GEO. HoLToN, WILLIAM H. PURDY. 

